Relay arrangement



2 Sheets-Shoat 1 RELAY ARRANGEMENT Filed Aug. 29, 1921 P. K. VAN DER STERR ET AL Jul/ M12720 aka/law IQ; fwd, (f M July 28, 1925;

July 28, 1925. r 1,547,850

P. K. VAN DER STERR ET AL RELAY ARRANGEMENT Filed Aug. 29, 1921 2 Sheets-Sheet 2 llllll I 1 III'II Patented July 28, 1925.

UNITED STATES PATENT OFFICE.

PETBUS KLAAS VAN DER STERR AND ALBERT PHILIPP BENDER, OF FRANKFORT-O'N- THE-MAIN, GERMANY, ASSIGNORS, BY MESNE ASSIGNMENTS, TO WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

RELAY ARRANGEMENT.

Application filed August 29, 1921.

To all whom it may concern:

Be it known that we, PETRUS KLAAs VAN DER STERR, a subject of the Queen of H01- land, and ALBERT Pnrmrr BENDER, a citizen of the Republic of Germany, and residents of Frankfort-on-the-Main, Hanauerlandstrasse 152/158, Germany, have invented certain new and useful Improvements in Relay Arrangements (for which we have filed an application in Germany May 19, 1919, and July 24,1919), of which the following is a specification.

This invention has for its object to do away with the inconveniences connected with relays which are of such construction that, for their operation, a comparatively great energy is required. The invention relates to reverse-current relays which depend on temporarily-occurring directing forces for current and voltage and which fail in almost all cases when, in consequence of short circuiting, the voltage of the line in proximity to the reverse-current relay has fallen to a value which is insufficient to oper ate the relay. This defect is overcome, according to the invention, by the arrangement that the relay proper (for instance, a reverse-current relay) exerts only a very feeble effect which is just sufficient for the adjustment of the relay, the energy which is required for producing the contact being supplied by an auxiliary slowly acting device, e. g., by an overload-current time relay, voltage-drop relay or the like. Owing to this arrangement, a secure contact will be obtained even if the directing forces at disposal in the reverse relay are very feeble only.

In order that the invention may be clearly understood, I shall proceed to describe the same with reference to the two forms of construction of the improved relay show, by way of example, in the accompanying drawing wherein Fig. 1 shows the relay of one form of construction in the position of rest.

Fig. 2 is an intermediate position of said relay.

Fig. 3 shows the relay in the final or circuit-closing position.

Fig. 4 represents, in side elevation, the relay of another form of construction in normal position.

Serial No. 496,675.

Fig. 5 is a plan view of the device shown in Fig. 1.

Fig. 6 shows, in plan view, the relay in the final or circuit-closing position.

The reverse-current relay comprises a Ferraris disc (4 which is under the control of the current coil 7) and of the voltage coil 0. According to the direction of the current, the hand (Z of the reverse relay a will slightly turn to the right or to the left. A stop 6 serves to stop the hand when the direction of current is normal. A contact f serves for the reverse-current release. 9 is a time relay which is operated in any convenient manner. for instance, with the aid of an overload-current relay 2 and which serves for completing a circuit to the relay 9, thereby pulling a core it into a coil '5. In the form of construction shown in Figs. 1 to 3, 7c is an extension of the time relay terminating in a point and designed to push sidewise the hand (Z of the reverse-current relay a, if, during the operation of the timelag relay, the current should be reversed.

hen current traverses the circuit in the opposite direction so that the overloadcurrent relay g is operated and current is supplied to the time relay 9, and the core 5 is pulled into the coil 6, the pointer 70 moves upwardly and, as point d of the reversecurrent relay has moved slightly to the left towards the contacts f, the pointer 73 pushes said hand farther to the left. At the end of the operation, when the reverse current continues, (Fig. 3) the hand (Z has been pushed by the pointer is so far to the left that the contact for the release of the corresponding switch is established at An especially good solution of the problem upon which the invention is based is obtained by the form of construction of the relay which is shown in Figs. 4 to 6 and in which the auxiliary device serves to close directly a contractor f, which is possible, however, only when an insulating body, preventing the closing of the contactor f and controlled by the main relay, has moved from its position between the contacts. In this form of construction, a is a reversecurrent relay with the current coil 7) and with the voltage coil 0, (Z is the hand upon the free end of which a plate Z of insulating material is fixed, g is the time relay Whose core h is to be pulled into the coil An extension m of; the core it serves for closing the contactor for tripping the circuit breaker. 7

At the'normal position shown in Fig. 4, the time relay 9 is at rest. The insulating plate Z of hand d stands between the two contacts of contactor f, as can be seen in Fig. i. lVhen reverse current traverses the protected circuit, the relay a. oscillates slightly. At the same time, the overloadcurrent r ay ha be n. closed by the-imp l e from'the excess current so that the coil 2' a racts th core ii. When th e e se c rent continues, the contractor f will then be ch s d by t e extension m of the cor n as th insulating plat Z has mo aw y rom ,betwee rt-he contacts f ('F g- As ca be seen. fro the drawing, a very feeble directing force is suliicient for the reverse-current y a, as the workof closing the contactor 3 lt- 211 B SQIlti iHy by the time relay g.

The arm m a f the relay as a switch for th sta 11 g of aconta t losing is advanta 1 als for othe a angements but for re e current relays.

1a A relay mpr sinain ombinat on, Ferraris disc, a controlswitch, a currentresponsive coilconnect ed series in the line circui a voltag co l conne t ac os v h line, d c be ng under thejo n c n ro Of saidcoils ando-perated in one direction or the: othendepending upon the direction of rrent th an overl ad e ay con:

.nected in series in the line, a slow-acting device ccntr led. y aid verl ad relay and set in ope ation upcnie ce sl e. cur en and m ans a uated, by a d slow ac lng devic cont 1d y's i Fs rar s cli cfor prating sad SWLE hi re y omprising, n cmbinat cn, a is, a cu rent coi on ecte in he line, a voltage coil connected he. line, sa d d s being nder th jo n cen of aid mil and perated n 0. dir ct en r h other ac ording t t 1 ac ion of curren flow n, the ine, an e rloadrelay connected in the line, a slow-acting device controlled by said overload relay and s t in operation upon, s i e u en flow, a switch adapted to lee-operated by said slow acting device upon a predetermined movement thereof, a member connected to said disc normally permitting circuit-interrupting operation of said switch, the operating member being adapted to move from operative position upon a reversal in the direction ofcurrent movement.

3. A relay comprising in combination, a Ferraris disc, a control switch, an arm on the disc for engagement with the switch, a current-responsive coil connected in series in the line circuit, a voltage coil connected across the line. said disc being under the joint control of said coils and operated in one direction or the other depending upon the direction of current movement in the line an overload rel-a connected in series 7 i connected across the line, said disk being under the joint controlvof said coils and operated in one direction or the otherdepending upon the direction of current move ment i the line, an overloadrelay connected; in series relation .to the line, a longtime-element relay controlled by said overload relay upon theoccnrrence of excessive current in the line, a member constituting a pointed element of, and actuated. by, the long-time relay for eiierting positive pressureron said arm in a direction longitudinally of. said ar nand member, movement of thevFerraris disc determining whether the arm is moved intoor out of operative engagement with the switch.

In testimony whereof we aflix our signatures in presence of two witnesses:

PETRUS KLAAS VAN DER STERB. ALBERT PHILIPP BENDER. lVitnesses REIN ARDT THEODOR BAR, G. DrNsDr. 

